Acceleration of Piston Durability Testing in Natural Gas Engines

The duration of piston durability tests is often shortened by increasing mechanical and thermal engine loads and loading frequency. Such durability tests are useful for assessing the structural integrity of new piston designs, but test results are generally not indicative of the expected service lif...

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Bibliographic Details
Published in:SAE transactions 1993-01, Vol.102, p.366-373
Main Authors: Vertin, Keith D., Keribar, Rifat, Ganapathy, Venkatesh
Format: Article
Language:English
Subjects:
Cylinders
Durability
Engines
Failure modes
Fatigue
Fatigue life
Natural gas
Pistons
Service life
Tensile stress
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Summary:The duration of piston durability tests is often shortened by increasing mechanical and thermal engine loads and loading frequency. Such durability tests are useful for assessing the structural integrity of new piston designs, but test results are generally not indicative of the expected service life. Furthermore, improper test procedures can introduce illegitimate failure modes which are not present in actual service. Two aluminum pistons were analyzed to gain a fundamental understanding of piston response due to accelerated test loads. The influence of engine speed, fuel/air ratio, intake manifold pressure and crank case oil temperature on piston fatigue life was studied. Guidelines were established to aid in developing a more effective durability test procedure for natural gas engine pistons.
ISSN:0096-736X
2577-1531